Plantoil/diesel conversion basics
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Posts: 1
Reply with quote  #1 
Hello, I don't know how I didn't find the forum earlier.
anyway. I have a lot of oil that I can not get the water out of and I am planning to drive to florida from NY in a week.  I am starting to think there may be more than water in it. 
here is my set up: 275 gal oil tank-2" Ball valve on bottome, 3/4" ball valve 1/3 of the way up the tank, and a 1 1/2" pvc stand pipe from top of tank to bottom to fill the tank.  I also have a hot water heater similar setup as the frybrid still 80gal running 220v element at 110v.

I finished this system about 3 weeks ago and started filling the large tank.  I filled the water heater with oil that sitting in 15g drums for a few months, (left about 6" in the bottom of each). So I fired up the heater and circulated the oil around with the pump for about 8 hours. let it settle for  almost a week, poure off 3-4 gal from drain. failed the HPT. heated it 3 more times and repeated steps. 2 times I heated it didn't circulate, and then the last time I heated it, I left on for 30 hours while circulating.  everything falled hpt. this waisted 2 weeks. so last night I pumped all this oil back into the 275 tank. HPT oil at my 3/4" valve, failed and then I pulled right off the top, that too failed.  So being in the garage in NY, I now have 2 electric heaters pointed at the big tank, should I add an air stone and bubbles?

SO anyone have any suggestions for my to make 150g of dry oil in 1 week!!!!!!!!


Posts: 934
Reply with quote  #2 
Suspended water tends to remain suspended in WVO that is too viscous for it to settle. This is why wvo must usually be heated in order for suspended water to begin falling toward the bottom. But heating tends to create convection currents in the WVO which will mix the suspended water back into the WVO. So heating must be gentle enough to not induce strong upward currents in the wvo. Some kind of baffling strategically placed can help minimize the effect of these currents as well.

Circulating the wvo with a pump tends to negate ANY settling of suspended water that has occurred. 

Also...generally speaking unless wvo is first filtered to less than 20 microns suspended water tends to settle very slowly.  I do not see any indication that you have prefiltered to this level prior to attempting to settle suspended water and so am assuming that this is also part of the problem. 
Bubbling air through the wvo is unlikely to help much unless you add lots of heat and have very dry ambient air. And under those conditions some polymerization is probably going to occur. Using partially polymerized fuel is asking for some very vexing problems later.

Given the information you provided this is the only guidance that I can provide. Please post more info if you think of it.

De-watering units like the Simple Hand pump Prefilter Unit (or the Frybrid "still" which is loosely based on it) are significantly less likely to work correctly if they are modified in any way. My best suggestion for long term success is to choose a design and scrupulously follow the direction to build and operate it. The tie to attempt to make it better is AFTER you are able to consistently get adequately dry wvo from it.

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